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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 2,311 | $ 1,862
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,388 | 2,158
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,417 | 1,598
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,520 | 1,602
Impaired financing receivables, with an allowance recorded, Related Allowance | 179 | 125
Impaired financing receivables, Recorded Investment, Total | 3,728 | 3,460
Impaired financing receivables, Unpaid Principal Balance, Total | 3,908 | 3,760
Impaired financing receivables, Related Allowance, Total | 179 | 125
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 760 |
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 760 |
Impaired financing receivables, with an allowance recorded, Recorded Investment | 265 | 438
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 365 | 438
Impaired financing receivables, with an allowance recorded, Related Allowance | 60 | 4
Impaired financing receivables, Recorded Investment, Total | 1,025 | 438
Impaired financing receivables, Unpaid Principal Balance, Total | 1,125 | 438
Impaired financing receivables, Related Allowance, Total | 60 | 4
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 218 | 693
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 218 | 913
Impaired financing receivables, with an allowance recorded, Recorded Investment | 314 | 317
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 314 | 317
Impaired financing receivables, with an allowance recorded, Related Allowance | 8 | 6
Impaired financing receivables, Recorded Investment, Total | 532 | 1,010
Impaired financing receivables, Unpaid Principal Balance, Total | 532 | 1,230
Impaired financing receivables, Related Allowance, Total | 8 | 6
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 43 | 44
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 47 | 48
Impaired financing receivables, Recorded Investment, Total | 43 | 44
Impaired financing receivables, Unpaid Principal Balance, Total | 47 | 48
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 957 | 977
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,030 | 1,049
Impaired financing receivables, with an allowance recorded, Recorded Investment | 378 | 383
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 381 | 387
Impaired financing receivables, with an allowance recorded, Related Allowance | 105 | 109
Impaired financing receivables, Recorded Investment, Total | 1,335 | 1,360
Impaired financing receivables, Unpaid Principal Balance, Total | 1,411 | 1,436
Impaired financing receivables, Related Allowance, Total | 105 | 109
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 333 | 148
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 333 | 148
Impaired financing receivables, with an allowance recorded, Recorded Investment | 460 | 460
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 460 | 460
Impaired financing receivables, with an allowance recorded, Related Allowance | 6 | 6
Impaired financing receivables, Recorded Investment, Total | 793 | 608
Impaired financing receivables, Unpaid Principal Balance, Total | 793 | 608
Impaired financing receivables, Related Allowance, Total | $ 6 | $ 6

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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